Classification of Clastic Sedimentary Rocks Based on Grain Size / Sed Strat #2 | GEO GIRL
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- čas přidán 21. 07. 2024
- Learn how to classify sedimentary rocks based on grain size! This video covers grain size classes of sediment and detrital rocks and the affect transport and diagenesis can have on grain size, porosity, and permeability of sedimentary rocks.
Just like in igneous petrology, sedimentary textures are smaller scale than sedimentary structures. But textures in sedimentary rocks are a bit different than textures in igneous rocks, especially when considering clastic or detrital sedimentary rocks. Common sedimentary textures include hydrodynamic textures, diagenetic textures, biogenic textures, and colloform textures. Clastic sedimentary rocks are classified by grain size. Grain size classes of sediment include gravel, sand, silt, and clay or mud, which each have individual classes of grain size and specific grain size diameters. Clastic rocks can then be classified using these grain size definitions: a rock containing mostly gravel is conglomerate or breccia, a rock containing mostly sand is sandstone, a rock containing mostly silt is siltstone, a rock containing mostly clay is claystone or shale. However, sedimentary rocks can contain more than 1 grain size, so we have to use a binary naming system for those (for example, sandy siltstone or silty sandstone). But what does this grain size identification get us? Grain size of sedimentary rocks can tell us about the depositional environment in which the rock was deposited and formed, as well as the transport mechanisms that led to its deposition. We can also gain information about the diagenesis of the rock by looking at grain sizes, porosity, permeability, and cement in the sedimentary rock. This becomes very important when we are looking for oil and gas reservoirs as diagenesis heavily affects porosity and permeability of sedimentary rocks and therefore their ability to store and transport fluid.
References: Sedimentary Rocks by Pettijohn: amzn.to/3tnWuVu
Sedimentology and Stratigraphy by Boggs: amzn.to/31VIG9x
GEO GIRL Website: www.geogirlscience.com/ (visit my website to see all my courses, shop merch, learn more about me, and donate to support the channel if you'd like!)
0:00 video outline
0:46 sedimentary textures vs structures
1:58 common sedimentary textures
4:00 grain sizes & limits
7:55 rock types based on grain size
8:52 how to name rocks with more than 1 grain size
10:28 grain sizes in rocks tell us about depositional environment?
12:32 grain size reduction during transport
15:44 transport mechanisms that abrade grains
16:28 diagenesis also affects grain size
17:04 related videos you may find helpful
18:59 upcoming videos & references
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Studying for the FG exam in March, all your videos have been great review. Thanks for this!
Its just too good. I was just studying sedimentary textures from sam boggs and then your video came. Its just became too simple to understand thanks to you. I have been watching your video since very start of your channel and its just getting better and better. Good luck geo girl🤗
Wow! You are a true fan if you've been watching me that long! Thanks so much for your continued support! I am so glad you find my videos helpful and easy to understand😊
I really like your videos. I have learned a lot. Thanks!
Thanks so much for the comment, I am so glad you have learned a lot from my videos! :D
Thank you for another great presentation👍👍
I like your style ! Thx for this, and all the other juicy vids I haven't seen yet.....
So glad you found my channel and you like my videos! I hope you enjoy the rest as well ;D
It’s just another regular Wednesday for me. Thank you very much for making my day more interesting with this fascinating and educational video. I hope you’re having a great day. Terrific video. 😊❤😉👍
Thanks! I hope you are having a great day as well!
@@GEOGIRL Thank you my friend. ❤
Thanks Geo girl.
Of course, thank YOU for the comment! :)
Woah!!! Where did This Channel come from! Absolutely Fantastic! Ty. 💕💕😎
Aww this comment made my day! I am so glad you liked the video, I hope you also check out and enjoy the rest on my channel that interest you ;D
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I hope you enjoyed it! :)
Duh… loved it
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Goooooodd..Thank you GeoGirl
Soooo glad you like it!!! You are very welcome Veli ;)
@@GEOGIRL thank you GeoGirl.пожалуйста
I have no idea how this was in my recommended, I've never looked up rocks before. Hope to see more rock licking pallet knowledge.
Haha, well I am glad it showed up for you and you decided to check it out! Thanks so much for the comment, I hope you stick around for future videos ;)
The CZcams algorithm gods shined upon us 😂. I’m sharing this channel to my fellow rock and gem clubs. They are gonna Love this find.
@@davejackson9819 Yes! So grateful for you, I hope they love it ;D
Thanku so much love from INDIA
Of course! I am glad you liked it ;D (or at least the first 3 minutes of it hahaha)
After 22 second when you uploading new knowledgeable lecture
Ma'am, what is the difference between matrix and cement??
To my understanding, a fine-grained matrix can include small detrital or clastic particle, while cement is chemical by definition.
For example, if you have a sandy conglomerate and your large gravel grains aren't in contact with each other, we would say that the gravel grains/clasts are suspended in a finer-grained matrix (in this case a sandy matrix).
Whereas, cement only applies to the chemical precipitates that glued the grains together during or after deposition.
Hope that makes sense. If you have any more question, don't hesitate to ask! ;)
@@GEOGIRL thanks ma'am
Thank you so much you helped ma alot ❤❤❤
This is a very "muddy " subject until you cleared it up!🙂
Good luck 🏆
I'm so glad I don't eat chocolate. That would have cursed me for the rest of my life. 😂😂😂💖
Instant sub
That means so much to me, thank you for your support! I am so glad you liked the video :)
Wow read that title and was like "God dame that's the video for me"
Yes! So glad to hear that, I hope the information in the video was helpful for you :)
Whats the chances you post this right before my first sedimentology lab? Haha
Haha! Yes, perfect timing! Best of luck ;D
After long wait...thank you mam....please make a video on depositional environment. I have exam on 20 feb....it would be great help for me.
So glad you liked the video! :) I actually wasn't going to make a depositional environments video because I have a whole playlist of videos about depositional environments on my channel already: czcams.com/play/PL69bBhmsrgfsrQyfSaxx5ioVhhfwtyAHI.html
Check out the playlist and let me know if I am missing any info you need and I will try to make more on the missing information.
I hope you find those videos helpful. I shot them a long time ago, so the video quality isn't the best, but I promise the information is good ;)
@@GEOGIRL Thank you mam....you have covered everything....great help mam
@@GEOGIRL Mam if possible please make the video on petrogenesis of granites, basalts, ophiolite suite,
komatiites, syenites, boninites, anorthosites and layered complexes, and
alkaline rocks (carbonatite, kimberlite, lamproite, lamprophyre); mantle
metasomatism, hotspot magmatism and large igneous provinces.
@@Kashi_Tales So glad to hear that, best of luck on your exam!! 👍
@@Kashi_Tales Wow thanks for all the suggestions! I will work on those ;)
haha, @1:07 theres a rock like I keep seeing...Should have found this video first...ahaha
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*lick*...... *taste*..... *smacks lips*
"it's uranium. definitely uranium."
Hahaha oh gosh, that is hopefully not what you are licking when I tell you to lick the rocks lol!
I am second
Haha! Wow, I love you guys, I have the best audience ever
I am First
Haha, yes!! Thanks for the TWO comments, your support means the world to me!
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Weight loss detritus 😂
I know right lol